Combustion vs Hlawv
Keeb kwm oxidation cov tshuaj tiv thaiv raug txheeb xyuas raws li cov tshuaj tiv thaiv uas cov pa oxygen koom nrog. Nyob ntawd, cov pa oxygen ua ke nrog lwm cov molecule los tsim cov oxide. Hauv cov tshuaj tiv thaiv no, cov pa oxygen txo qis thiab lwm yam khoom siv oxidation. Yog li hauv paus oxidation cov tshuaj tiv thaiv yog ntxiv oxygen rau lwm yam khoom. Piv txwv li, hauv cov tshuaj tiv thaiv hauv qab no, hydrogen raug oxidation thiab, yog li ntawd, oxygen atom tau ntxiv rau hydrogen ua dej.
2H2 + O2 -> 2H2O
Lwm txoj hauv kev los piav txog oxidation yog qhov poob ntawm hydrogen. Muaj qee lub sijhawm uas nws nyuaj los piav txog oxidation li ntxiv oxygen. Piv txwv li, hauv qab no cov tshuaj tiv thaiv oxygen tau ntxiv rau carbon thiab hydrogen. Tab sis tsuas yog carbon tau dhau oxidation. Hauv qhov no, oxidation tuaj yeem piav qhia los ntawm kev hais tias nws yog qhov poob ntawm hydrogen. Raws li hydrogens tau raug tshem tawm ntawm methane thaum tsim cov pa roj carbon dioxide, cov pa roj carbon tau raug oxidized.
CH4 + 2O2 -> CO2 + 2H 2O
Muaj ntau hom kev tawm tsam oxidation. Qee qhov tshwm sim hauv ib puag ncig ntuj txhua hnub. Piv txwv li, kev ua pa ntawm tes, uas ua rau lub zog hauv txhua lub cev muaj sia nyob hauv lub hlwb, kuj yog cov tshuaj tiv thaiv oxidation. Feem ntau ntawm cov khoom yog sib txuas nrog atmospheric oxygen thiab tsim oxides. Mineral tsim thiab hlau xeb yog cov txiaj ntsig ntawm qhov no. Lwm yam tshaj li qhov tshwm sim ntuj, muaj cov txiv neej koom nrog oxidizing cov tshuaj tiv thaiv ib yam nkaus. Hlawv thiab combustion yog qee qhov oxidizing cov tshuaj tiv thaiv uas tib neeg koom nrog.
Combustion
Combustion lossis cua sov yog cov tshuaj tiv thaiv uas kub yog tsim los ntawm cov tshuaj tiv thaiv exothermic. combustion yog ib qho tshuaj tiv thaiv oxidation. Rau qhov kev tshwm sim tshwm sim, cov roj thiab cov oxidant yuav tsum nyob ntawd. Cov khoom uas raug combustion yog hu ua fuels. Cov no tuaj yeem yog hydrocarbons xws li petrol, diesel, methane, lossis hydrogen gas, thiab lwm yam. Feem ntau cov oxidizing tus neeg sawv cev yog oxygen, tab sis kuj muaj lwm yam oxidants xws li fluorine thiab. Hauv cov tshuaj tiv thaiv, cov roj yog oxidized los ntawm oxidant. Yog li qhov no yog oxidation cov tshuaj tiv thaiv. Thaum siv hydrocarbon fuels, cov khoom tom qab ua tiav kev sib txuas yog feem ntau carbon dioxide thiab dej. Nyob rau hauv ib tug ua tiav combustion, ob peb cov khoom yuav raug tsim, thiab nws yuav ua tau lub siab tshaj plaws zog tso zis uas lub reactant yuav muab tau. Tab sis kom ua tiav combustion tshwm sim, tsis muaj kev txwv thiab tsis tu ncua cov pa oxygen thiab qhov ntsuas kub zoo yuav tsum nyob ntawd. Ua kom tiav combustion tsis yog ib txwm nyiam. Qhov tsis tiav combustion tshwm sim. Yog hais tias qhov combustion tsis tshwm sim kiag li, cov pa roj carbon monoxide thiab lwm yam khoom tuaj yeem tso tawm rau hauv qhov chaw, uas tuaj yeem ua rau muaj kuab paug ntau.
Burning
Ntawm no kuj yog hom combustion. Yog tias cov nplaim taws tshwm sim los ntawm cov txheej txheem combustion, ces nws yog hu ua hlawv. Thaum cov khoom siv hluav taws xob thiab cov pa oxygen ua ke, cov khoom yuav hlawv. Raws li qhov tshwm sim, tshav kub thiab lub teeb lub zog raug tsim.
Dab tsi yog qhov sib txawv ntawm combustion thiab hlawv?
• Kub kub kuj yog hom combustion.
• Thaum kub hnyiab, tuaj yeem pom cov nplaim taws. Tab sis combustion yog ib qho kev tshwm sim tshwm sim tsis muaj nplaim taws.
• Txij li thaum feem ntau ntawm lub zog hloov mus rau lub teeb lub zog hauv kev kub hnyiab, qhov tsim tawm ntawm cov cua sov tuaj yeem tsawg dua hauv kev sib txuas.
